pull back vs back out

pull back and back out both are verbs.

Word	Noun	Adjective	Verb	Adverb
pull back	No	No	Yes	No
back out	No	No	Yes	No

As verbs, pull back and back out are synonyms defined as:

pull back and back out: make a retreat from an earlier commitment or activity

Other synonyms of pull back include back away, crawfish, crawfish out, pull in one's horns, retreat, withdraw.

pull back (verb)	back out (verb)
make a retreat from an earlier commitment or activity	make a retreat from an earlier commitment or activity
move to a rearward position; pull towards the back	move out of a space backwards
stretch back a bowstring (on an archer's bow)
use a surgical instrument to hold open (the edges of a wound or an organ)
pull back or move away or backward